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| 001 | 867761 | ||
| 005 | 20240619083557.0 | ||
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| 037 | _ | _ | |a FZJ-2019-06376 |
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| 100 | 1 | _ | |a Park, Gunwoo |0 P:(DE-Juel1)173831 |b 0 |e Corresponding author |u fzj |
| 111 | 2 | _ | |a International Soft Matter Conference |g ISMC2019 |c Edinburgh |d 2019-06-03 - 2019-06-07 |w UK |
| 245 | _ | _ | |a The effect of dispersion transport properties on the concentration-polarization layer in crossflow ultrafiltration |
| 260 | _ | _ | |c 2019 |
| 336 | 7 | _ | |a Conference Paper |0 33 |2 EndNote |
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| 520 | _ | _ | |a Crossflow filtration is a pressure-driven separation and enrichment process for colloidal dispersions where the feed dispersion is continuously pumped through a membrane pipe. The transmembrane pressure (TMP) causes solvent to flow out of the membrane, while the colloidal particles are retained inside the pipe. Consequently, a particles-enriched diffuse layer is formed near the membrane wall which reduces the filtration efficiency. This so-called concentration-polarization (CP) layer is due to the balance of flow advection of particles towards and gradient diffusion away from the membrane. In the ultrafiltration regime where Brownian motion dominates flow convection, the collective diffusion coefficient and the dispersion viscosity are the key transport properties determining the CP layer in conjunction with the TMP and transmembrane osmotic pressure. In this study, we present a finite-element (FEM) method for calculating the CP layer and suspension flow profiles in a crossflow ultrafiltration setup [1]. We show that the FEM-calculated CP layer profiles are in quantitative agreement with results obtained from a simplifying boundary layer analysis [1]. Results for the filtration and flow profiles are discussed for different globular dispersion particles including colloidal hard spheres (as a reference system), solvent-permeable particles such as non-ionic microgels [2], impermeable charge-stabilized particles [3], and ionic microgels with concentration-dependent size [4]. We pay particular attention to the effect of the different transport properties and osmotic pressure dependencies on the ultrafiltration profiles.References[1] G. W. Park and G. Nägele, “Analytic and numerical approaches to concentration-polarization layers in cross-flow ultrafiltration with a cylindrical membrane pipe” (in preparation)[2] R. Roa et al., “Ultrafiltration modeling of non-ionic microgels,” Soft Matter 11, 4106-4122 (2015) [3] R. Roa et al., “Ultrafiltration of charge-stabilized dispersions at low salinity,” Soft Matter 12,4638-4653 (2016)[4] M. Brito et al., “Deswelling effects on structural and transport properties of ionic microgelsuspensions” (in preparation) |
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